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|Title: ||Is it necessary to include biarticular effects within joint torque representations of knee flexion and knee extension?|
|Authors: ||King, Mark A.|
Lewis, Martin G.C.
Yeadon, Maurice R.
|Keywords: ||Computer simulation|
|Issue Date: ||2012|
|Publisher: ||© Begell House|
|Citation: ||KING, M.A., LEWIS, M.C.G., YEADON, M.C.G., 2012. Is it necessary to include biarticular effects within joint torque representations of knee flexion and knee extension? International Journal for Multiscale Computational Engineering, 10 (2), pp. 117-130.|
|Abstract: ||The purpose of this study was to consider whether it is necessary for biarticular effects to be accounted for in subject-specific representations of maximal voluntary knee extension and knee flexion torques. Isovelocity and isometric knee torques were measured on a single participant at three different hip angles using a Contrex MJ dynamometer. Maximal voluntary torque was represented by a 19-parameter two-joint function of knee and hip joint angles and angular velocities with the parameters determined by minimising a weighted root mean square difference between measured torques and the two-joint function. The weighted root mean square difference between the two-joint function and the measured knee flexion torques was 14 Nm or 9% of maximum torque, whilst for knee extension the difference was 26 Nm or 9% of maximum torque. The two-joint representation was shown to be more accurate than an existing single-joint representation for torques measured at hip angles other than those used to derive the single-joint function parameter values. The differences between the traditionally used single-joint representation and the measured knee flexion and knee extension torques were largest for the most extended hip joint angle (15% and 18% of maximum torque respectively) while the corresponding differences for the two-joint function were 9% and 8% of maximum torque. It is concluded that a two-joint function can account for changes in knee flexion and knee extension joint torques due to both monoarticular and biarticular muscles over a range of both hip and knee angles, and this has the potential to improve the biofidelity of whole body subject-specific torque-driven simulation models.|
|Description: ||This article is closed access. It is available at: http://dx.doi.org/10.1615/IntJMultCompEng.2011002379|
|Version: ||Closed access|
|Publisher Link: ||http://dx.doi.org/10.1615/IntJMultCompEng.2011002379|
|Appears in Collections:||Closed Access (Sport, Exercise and Health Sciences)|
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